Annual Loss Factor (ALF) Tool

We will be releasing ALF 4.0 soon. Watch this space for more details.

ALF 3.2 (Annual Loss Factor) tool is a free online aid to the thermal design of houses. It is presented in a step-by-step format providing a simple method of calculating the energy performance of conventional New Zealand houses.

ALF 3.2 is a verification method for determining the Building Performance Index (BPI), which can be used to show compliance with the Energy Efficiency Clause H1 of the New Zealand Building Code.

ALF 3.2

The ALF programme has been optimised to work with most web browsers. Alternatives that are suitable are: Opera 9 or higher, or Safari 2 or higher.

To sign up as a New User, go to the "get a subscription" link along the top bar of the page and fill in the details. You can request a new password if you have forgotten or misplaced it.

At this stage, MyBRANZ logins will not work due to the different systems but will link together shortly.

Should you have any ALF-related queries or need assistance, please phone the BRANZ help line: